層状複水酸化物のオンサイト生成法を活用した有害元素の水処理技術

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タイトル別名
  • On-site Formation of Layered Double Hydroxide Compounds and Application to Water Treatment of Toxic Elements
  • 実用環境技術シリーズ 層状複水酸化物のオンサイト生成法を活用した有害元素の水処理技術
  • ジツヨウ カンキョウ ギジュツ シリーズ ソウジョウフクスイサンカブツ ノ オンサイト セイセイホウ オ カツヨウ シタ ユウガイ ゲンソ ノ ミズショリ ギジュツ

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Removal of toxic elements in effluent at low concentration is difficult technique and an effective method has not been established. This paper describes a novel water treatment process that composeds of the following processes ; addition of divalent and trivalent metal ions, conditioning of the slurry with alkaline reagent, neutralizing reaction, returning the settled slurry and gravitational settling of the solids. This neutralization-sedimentation system with slurry returning process allows the formation of so-called Layered Double Hydroxide (LDH) precipitates, which play key roles in removing toxic elements. In the selenate removal process, Green Rust (GR), Fe(II)-Fe(III) type LDH compound, reduce selenate to elemental selenium in anoxic condition, while GR is consequently oxidized to Magnetite (Fe3O4). The black-colored magnetic slurry containing GR and Magnetite contributes to the removal of selenate.<br>In the fluorine removal process, Hydrotalcite, Mg(II)-Al(III) type LDH, surrounds the neutralizer MgO particle, thereby forming a core-shell structure. Optimum fluorine removal ratio reaches 95%, where initial fluorine concentration 15 mg/L decreases below the national environmental standard, 0.8 mg/L. This proposed processe serves as alternative treatment technique for low concentrated toxic elements.

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  • 粉体工学会誌

    粉体工学会誌 50 (5), 342-347, 2013

    一般社団法人 粉体工学会

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